# How do you find normality of solution?

How do you find pH of a solution with no indicator? Well if you don't want to use pH meter, the only other way to find out is using the pH paper which turns into different colours respectively to the pH of the solution, that is not too accurate,...

### Will the normality of an NaOH solution increase or decrease if the solution is exposed to air for prolonged periods?

If the solution volume remains unchanged, the normality will decrease as the NaOH will react with CO2 present in the air. Of course, if the solution volume is not held constant and if the evaporation rate is sufficient to concentrate the solution - it could also increase (effectively raising the normality of the remaining solution).

### Difference between normality and molarity?

Normality is another way to express the concentration of a solution. It is similar in many ways to molarity. The difference is that molarity is way to provide information about the number of molecules in a liter of solution and normality provides information about the number of reactive units in a liter of solution. Molarity is expressed in terms of moles of a compound per liter of solution. (Remember a mole is molecules) Normality is…